The bad programs
Not only the viruses mess with your PC and software as at least 3 more types of harmful programs are detected: worms, Trojans and logical bombs. Though, there’s no precise designation as Trojans may contain viruses and viruses – logical bombs.
The Trojan programs
The Greeks have a myth of the city of Troy conquest: they left a huge horse near the city gates and when the curious citizens pulled this horse in the soldiers broke out of the horse and conquered the city.
The Trojan programs work the same as its designation seems to be harmless until the user loads it to his PC when the program starts performing some undocumented functions. Often, The Trojans are used for viruses’ distribution by their original writing to BBS station and when downloaded by users they start infecting their PCs. After The Trojans complete their missions they may deactivate themselves to harden the detection of causes to system malfunctions.
The logical bombs
These are the programs or their modules that in certain conditions perform unauthorized actions. The logical bomb may “explode” at the certain date or when something is added to your database and only its developer may specify such conditions. These bombs may be integrated in viruses, Trojans and regular software.
There’s a famous case when a programmer developing the accounting system integrated some logical bomb in it. It periodically checked the lists for receiving salary and when its developer’s last name disappeared the bomb destroyed the system.
The logical bombs are widely used by black-mailers as let’s say a fired programmer may notify the management of logical bomb in a system and his ability to disable it (surely, for the good compensation).
The worms
The worms are designed for specific actions and are system integration oriented. They may detect the password for bank system entrance and transfer some amounts to accounts of their developers.
The most well known worm was developed by Cornell University student Robert Morris and getting into Internet on November of 1988 in 5 hours it was able to get into over 6000 wired PCs.
It’s hard to designate whether the program is a Trojan one and if it has a logical bomb. So, we advise you not to copy files from BBS, to never exchange the software with your pals and to never by a pirate copies of licensed software as any of these programs may have some harmful modules integrated.
How the infection goes?
The virus may never appear in your PC just by itself. If your PC is not wired to Internet and has no modem and got all disk-drives disabled the virus would have no chances to get there.
The virus may get to your computer only if it executes the infected program or loads some data from infected disk. Most of times the viruses get to computers with pirate software and Freeware and Shareware.
The basic ways for viruses’ penetration:
- Downloading programs from electronic billboards and global networks
- Disks and software exchange
- Penetration through the local network.
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